root account disable - /dev/vg00/lvol7 is corrupted

Hi.the root account is disabled, due to loss of root password. After trying the root PW, the account was disabled.So, I went the known way of 1)single user mode2)ISL3)hpux -is4)mount /usr in order to modprpw -k or to use the vi5)mount /var and mount /tmpI always receive /dev/vg00/lvol7 is corrupted, needs checking

The system worked just fine, before I brought it down. If I bring the system back into multi user mode, all applications work just fine. What can I do? any ideas?thanks Barbara